On the Spatial Statistics of Optical Flow - Analysis, Modeling, and Estimation
Speaker: Stefan Roth , Brown University
Date: November 3 2006
Time: 11:00AM to 12:00AM
Location: Seminar Room D463 (Star)
Host: Gerald Dalley, MIT CSAIL
Contact: C. Mario Christoudias, Gerald Dalley, 3-4278, 3-6095, cmch@csail.mit.edu, dalleyg@mit.edu
Relevant URL: NO ROOM CHANGE: Apologies for the false alarm. The talk will remain in D463 (Star). It is not being moved to Kiva.
In this talk I will present an analysis of the spatial and temporal statistics of "natural" optical flow fields and a novel flow algorithm that exploits their spatial statistics. Training flow fields are constructed using range images of natural scenes and 3D camera motions recovered from hand-held and car-mounted video sequences. I will present a detailed analysis of optical flow statistics in natural scenes, as well as machine learning methods for learning a Markov random field model of optical flow. The prior probability of a flow field is formulated as a Field-of-Experts model that captures the spatial statistics in overlapping patches and is trained using contrastive divergence. I will compare this new optical flow prior with previous robust priors and show how it can be incorporated into a recent, accurate algorithm for dense optical flow computation. Finally, using experiments with natural and synthetic sequences I will illustrate how the learned optical flow prior quantitatively improves flow accuracy and how it captures the rich spatial structure found in natural scene motion.
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